Woodyard, Leonard and Reeves all come upBen Reeves was handed his full debut by Blues boss Paul Sturrock, taking charge of his 150th game, in one of three changes made for the trip to Orient.
Reeves, who made a cameo appearance as a sub against Oxford, was joined in the starting XI by Ryan Leonard and Alex Woodyard.
Leonard, who scored the winning goal on Saturday, came back into the side on the left of midfield, with Woodyard replacing Laird in the middle.
Out of the side came Michael Spillane and Marc Laird who were both cup-tied, while Barry Corr dropped to the bench.
Gavin Tomlin remained absent after sustaining an injury last Friday.
Blues: Smith; Clohessy, Cresswell, Phillips, Barker; Hurst, Leonard, Woodyard, Timlin; Reeves, Assombalonga.
Subs: Prosser, Bentley, Corr, Spicer, Lavery